Automatic fire-alarm.



E. FRLANI.

AUTOMATIG Fm: ALARM. APPLICATION FILED DEU. 30, 190B.

925,575.. Patented 11111922, 1909.

Umm-D TES. 'PfATENEA I @FFW HERMANN restaurer PiRANo,`.iUsjrRia-Hnuoaar.

. Au'roMA'rrc FlurLilli..amr..`

Specification of LettersPatent- Patented ne. `2li-s11909i Appiicatioameenecembeiso, '1908.y seriwn.469,est. f i

To all whom t may' concern:

Be it known that I, HERMANN FUR'nANna subject of the Emperor ofAustria-Hungary, and residing at Pirano, in the Coast Provi ince ofaustria-Hungary, have invented cer- 'tain new and useful improvements inAuto-l matic Firedhlarms, of which the following is a specification.

This invention relates to an electric fire alarm, set in operation bythe fusing of an.

insulated mass disposed between conductive members, .the particularobject of the invention being to provide a device of this char-- actercomprising a structure adapted to be inverted and so arranged that whenthe structure is maintained, in -one position, the melting of af massfusible at a comparatively lowv temperature will set the alarm inoperation, and when maintained in a reverse p0- sitionhthemeltingof amass at a considerably higher temperaturewill set the alarm in'operation, whereby .in one and the same structure. means are providedfor protecting goods inflammable at varying temperatures.

Further objects and advantages 'of the in^ vention will be set fort-h inthe detailed description which now follows. l

Referring to the drawing, Figure l is a front elevation of a. devicecoizzructed in accordance with the invention, Fig.v 2 is a verticalsection thereof, Fig. 3 is a vertical sect-ion after one of the fusiblemasses has been melted, Fig. 4 is a. horizontal section,

and, Fig is a' vertical section of a modified formy o' the device. Likenumerals designate corresponding parts in all of the ligures of thedrawing.

Referring to the drawing, the numeral .i-

. designates an insulating back plate adapted to be inverted at willandr to be hung uponl the wall of a room in either position. This baaltplate is .piercedat i2l and 13 to facili tate hanging it in eitherposition desired. A. metallic -tube '2 is connected to a binding plate3, theiback plate also supporting a binding plate 4. The ends of thetube2 are l.plugged by insulating plugs 5 and 6 through which ends 1.0and 1l of an electrical conductor 50 pass. This electrical conductorisconnected to the binding plate 4 by branch conductor 50 (see Fig. 4,).vThe tube. is

divided into two pai-'ts by acentral wall, one compartment ofthe tubecontaining` an insulating mass S fusible at about 7 50 F. and

. l0 and the tube 2, it is apparent that Atric circuit will be completedbetween the other compartment ncontaining fan'i'linlsu-l lating mass 7,fusible approximately at,120 F. On each s-ide ofthe partition orwall isprovided a drop of mercury 9, the insulating masses 7 and 8 maintainingthese drops of mercury out.4 of contact with the points l@ f and 1'] ofconductor 50.

In the form of the device shown in Fig. 5, the parts are all toe sameand have been' given the same reference numerals except thatv the endsl0 and 11 of the conductors are brou'ghtto a point adjacent' the centralpartition plate of tube 2 and the insulating masses Zand 8 maintain thedro'ps of-mercury adjacent the plugs 5 and 6. It. will be apparent tl^erefore, that when the lowermost drop of mercury shown in Fig. 2is.permit ted to descend, by the melting of the mass 8, until it reachesthe end of the conductor 1l,

an electric circuit will be completed,- for one l of the wires, not shown of an electric circuit is to be attached to the binding plate, 3and."

the other wire thereof is to'be attached to the binding plate 4.The'circuit will therefore be completed through binding plate 3, tube 2,Ilowermost mercury drop -9'and conductor -5() tobinding plate 4. Ofcourse just exactly theV same thin@ happens at the other end of theItube when the tube, is inverted, the only diiference being that' itrequires a' diiferent degree of heat to bring about 'the completion of.the circuit.

In'Fig. 5, the two terminals of the electric? circuit are indicated atand 4 and ti wires 10 and 1l area part of the conductor 50 connecteddirectly to the terminal 4. Terminal 3, upon the other hand is directlyconnected to. tube 2. Therefore, when the uppermost drop of mercury inthis iigure desee establishes coninuinication between terminals 3 and 4.

From the foregoing description it Ywill be seen that simple and eiicientmeans are herein 'provided for acconiplishing the obn ects 'of theinvention, but while theelements shown 'and described are well adaptedto serve thepurposes for which they are intended, it is to be understoodthat the invention is not limited to the precise construction set forth,but includes within its Vpurview such changes as may be made within thescope of the appended claim.

Having described my invention, what claim 1s:

An automatic fire alarm cemprlslng a conductive tube, electric terminalsprojecting 5 into each end thereof and insulatecltherefrom, and movableconductive material normally maintained out of Contact With saidelectric terminals by separated fusible masses disposed at opposite endsof said tube and

